A Hunch
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K1s are due March 15th, the same day as corporate tax returns.
Your personal income tax is due April 15th or you can get a free extension to Oct 15th if needed.
mercedes
The return that the K-1 is part of is not due until March 15 so the partnership or small corp doesn't know what your share is yet.
?
Jan 31 is deadline for W2. K1's often come much later.
Anonymous
Because it is derived from the creation of a tax return, not just, say, interest on a bank account.